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Wu Y.,Anhui University | Wu Y.,Hefei Institute of Electronic Engineering | Wu X.,Anhui University
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica

This article establishes the geometric model of an airborne bistatic synthetic aperture radar (SAR) for the parallel squint mode and presents the expression of the radar echoes, and then derives its two-dimensional spectrum with an analysis of its characteristics. In the two-dimensional frequency domain, the point targets in the center of the observed scene are precisely imaged by multiplying the focusing function, and then the Chirp-Z transforms (CZTs) are employed to correct the range cell migration of the target echoes in either side of the center points. Finally, radar images are generated by the inverse Fourier transform on the azimuth direction. Since the algorithm utilizes the property of the CZT to process the nonlinear modulation frequency signals, the processing procedure is simplified, and computational efficiency and imaging precision are greatly improved. The simulation tests validate this new algorithm based on the CZT to process the data of the airborne bistatic SAR for the parallel squint mode. Source

Meng X.-H.,Hefei Institute of Electronic Engineering | Luo J.-Q.,Hefei Institute of Electronic Engineering | Ma X.-T.,Hefei Institute of Electronic Engineering
Kongzhi yu Juece/Control and Decision

Aiming at the signals sorting problem, a joint sorting algorithm based on direction finding of multiple observation and multi-parameter information is proposed based on the condition of multiple observers receiving the emitter pulse signals. Firstly, benchmark pulse is determined in the pulse stream of master observation platform, and matching pulse is searched by multi-parameter information in the pulse stream of slave observation platforms. Then the pulses maybe from the same emitters are searched through location and multi-parameter information in the master observation platform, and the pulses matching with the master observation platform in slave observation platforms are searched. Finally, matching pulses in the master observation platform are extracted. Experimental results show that, when the number of pulses observation platforms received is less and sorting algorithms based on the PRI statistical rule are no longer applicable, pulse sequences can still be sorted with high accuracy rate by using the proposed algorithm. © 2016, Editorial Office of Control and Decision. All right reserved. Source

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